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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Sanitary and Social Lectures by Charles Kingsley: will learn more about all that when you learn, as every civilised
lad should in these days, something about chemistry, and the laws
of fluids and gases. But you know already that flowers are cut
off by frost in the low grounds sooner than in the high; and that
the fog at night always lies along the brooks; and that the sour
moor-smell which warns us to shut our windows at sunset, comes
down from the hill, and not up from the valley. Now all these
things are caused by one and the same law; that cold air is
heavier than warm; and, therefore, like so much water, must run
down-hill."
"But what about the rainfall?"
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